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All results from a given calculation for C2H5CN (ethyl cyanide)

using model chemistry: MP2/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at MP2/Def2TZVPP
 hartrees
Energy at 0K-171.714109
Energy at 298.15K 
HF Energy-171.024654
Nuclear repulsion energy102.906124
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at MP2/Def2TZVPP
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3189 3034 11.76 63.26 0.70 0.82
2 A' 3106 2955 5.63 91.48 0.08 0.14
3 A' 3095 2945 12.20 170.72 0.01 0.01
4 A' 2207 2100 0.01 50.81 0.21 0.34
5 A' 1521 1447 5.10 4.08 0.74 0.85
6 A' 1487 1415 5.15 9.02 0.72 0.84
7 A' 1424 1355 1.56 0.94 0.19 0.32
8 A' 1354 1288 2.91 1.97 0.46 0.63
9 A' 1102 1049 3.19 4.87 0.12 0.21
10 A' 1039 988 0.48 4.36 0.46 0.63
11 A' 854 813 0.05 5.84 0.08 0.15
12 A' 537 511 0.53 1.38 0.23 0.38
13 A' 206 196 3.82 2.18 0.74 0.85
14 A" 3192 3037 10.35 20.73 0.75 0.86
15 A" 3154 3001 0.16 80.26 0.75 0.86
16 A" 1515 1441 7.44 7.33 0.75 0.86
17 A" 1302 1239 0.00 3.01 0.75 0.86
18 A" 1120 1065 0.50 0.09 0.75 0.86
19 A" 791 753 2.57 0.23 0.75 0.86
20 A" 380 362 0.23 1.62 0.75 0.86
21 A" 226 215 0.99 0.55 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 16400.6 cm-1
Scaled (by 0.9515) Zero Point Vibrational Energy (zpe) 15605.2 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at MP2/Def2TZVPP
ABC
0.92363 0.15758 0.14166

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/Def2TZVPP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.506 0.557 0.000
C2 0.000 0.822 0.000
C3 -0.766 -0.422 0.000
N4 -1.357 -1.431 0.000
H5 2.047 1.500 0.000
H6 1.796 -0.010 0.881
H7 1.796 -0.010 -0.881
H8 -0.290 1.399 0.877
H9 -0.290 1.399 -0.877

Atom - Atom Distances (Å)
  C1 C2 C3 N4 H5 H6 H7 H8 H9
C11.52902.47373.48531.08721.08701.08702.16862.1686
C21.52901.46082.63022.15642.16622.16621.08921.0892
C32.47371.46081.16963.40682.74002.74002.07672.0767
N43.48532.63021.16964.49203.56863.56863.14963.1496
H51.08722.15643.40684.49201.76591.76592.49802.4980
H61.08702.16622.74003.56861.76591.76232.51673.0700
H71.08702.16622.74003.56861.76591.76233.07002.5167
H82.16861.08922.07673.14962.49802.51673.07001.7539
H92.16861.08922.07673.14962.49803.07002.51671.7539

picture of ethyl cyanide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 111.638 C1 C2 H8 110.724
C1 C2 H9 110.724 C2 C1 H5 109.875
C2 C1 H6 110.666 C2 C1 H7 110.666
C2 C3 N4 178.718 C3 C2 H8 108.172
C3 C2 H9 108.172 H5 C1 H6 108.626
H5 C1 H7 108.626 H6 C1 H7 108.323
H8 C2 H9 107.255
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability